At its launch in 2025, the Springfield Armory Kuna quickly established itself as a premier PDW-style 9mm pistol. This was due not just to its well-considered feature set and ergonomics, but also to its performance — driven in no small part by its roller-delayed operating system. This system allows the pistol to offer the seemingly physics-defying combination of light weight and low-perceived recoil. The Strike Industries Polymer FSA STAB is shown here riding the rear Picatinny rail of the Kuna. According to the author, the two look like they left the factory together. Last year, I had the honor of…